AK-J707 Low Hydrogen Sodium Coated Electrode for 700MPa High Strength Steel.
A high strength, low hydrogen electrode with excellent crack resistance and low-temperature toughness, suitable for all-position welding of 700MPa grade structural steel and related components.
Product Overview
AK-J707 is a low hydrogen sodium coated electrode designed for manual metal arc welding of high strength steels with a minimum tensile strength of 690 MPa. It is suitable for all-position welding using direct current reverse polarity (DC reverse).
The electrode delivers excellent weld metal properties, including low hydrogen diffusion content of 5.0 mL/100g or less by mercury or thermal conductivity method, and meets the requirements for Grade I X-ray detection. It is formulated for high crack resistance and maintains impact toughness at low temperatures.
Application: Ak-J707 is a high strength steel electrode with low hydrogen sodium coating. DC reverse connection can be used for all-position welding. Excellent welding process performance, low hydrogen diffusion in weld, with excellent low-temperature toughness and crack resistance. It is mainly used for welding of 700MPa high strength steel structure steel, also used for welding of bridge, boiler and other related parts with the same strength.
Key Benefits
Low Hydrogen Diffusion
The sodium coating ensures diffused hydrogen content in the deposited metal is 5.0 mL/100g or less, reducing the risk of hydrogen-induced cracking in high strength steel welds.
High Strength and Toughness.
The deposited metal achieves a minimum tensile strength of 690 MPa and yield stress of 600 MPa, with elongation of at least 16 percent and excellent low-temperature impact performance.
All-Position Welding Capability
AK-J707 can be used in flat, horizontal, vertical and overhead positions with stable arc performance when operated with DC reverse polarity.
Excellent Crack Resistance
The electrode is formulated for high resistance to cracking, making it suitable for critical applications in bridge, boiler, and high strength structural components.
Where It Is Used
- Welding of 700MPa high strength structural steel.
- Bridge and heavy equipment fabrication.
- Boiler and pressure vessel components requiring high strength and toughness.
- Structural parts in heavy machinery and transport infrastructure.
Who It Is For
- Welding consumable distributors supplying high strength steel electrodes.
- Fabricators working with 700MPa grade steels in structural and heavy engineering.
- Contractors involved in bridge, boiler, and high-stress structural welding projects.
Problems It Solves
- Cracking in high strength steel welds due to high hydrogen content in the deposited metal.
- Lack of consistent low hydrogen performance across multiple electrode grades.
- Difficulty in achieving full-position welds on high strength steel without rework or defects.
Specifications
Published by the factory for AK-J707. Values not shown are not published on the datasheet and are marked as such rather than estimated.
| Standard | Designation |
|---|---|
| Classification | EN ISO —— AWS A5.5 E10015-G GB/T 32533 E6915-GP |
| Element | Content |
|---|---|
| C | 0.15 |
| Si | ≤0.80 |
| Mn | ≥1.00 |
| S | ≤0.030 |
| P | ≤0.030 |
| Ni | ≥0.50 |
| Mo | ≥0.20 Mechanical |
| Tensile strength (MPa) | ≥690 |
| Yield Stress (MPa) | ≥600 |
| Elongation (%) | ≥16 |
| Impact values (J) | —— Diffused hydrogen |
| content of deposited metal | ≤5.0mL/100g(mercury method or thermal conductivity method) X-ray detection requirements |
| Grade I Recommended parameters | (Polarity: |
| DC) 2.5mm | F(H)-70-100A/ |
| V(OH)-60-90A 3.2mm | F(H)-90-130A/ |
| V(OH)-80-120A 4.0mm | F(H)-140-180A/ |
| V(OH)-130-170A 5.0mm | F(H)-170-220A |
Mechanical property data for this grade is not published on the factory datasheet. Ask our technical team for the test record before you qualify it.
Note: 1. The electrode must be baked at 380 ° C for one hour before use. 2. Impurities such as water, oil and embroidery must be removed from the surface of the welding parts. 3. Short arc narrow pass welding, the maximum swing should not exceed three times the line diameter
Technical Features
- Low hydrogen sodium coating with diffused hydrogen content ≤5.0 mL/100g (mercury or thermal conductivity method)
- Deposited metal tensile strength ≥690 MPa, yield stress ≥600 MPa, elongation ≥16 percent.
- Suitable for all-position welding with DC reverse polarity.
- Meets EN ISO 10015-G, AWS A5.5 E10015-G, and GB/T 32533 E6915-GP classifications.
- Available in 2.5 mm, 3.2 mm, 4.0 mm, and 5.0 mm diameters.
Use Guide
- Bake the electrodes at 380 °C for one hour before use to ensure low hydrogen content.
- Remove all surface impurities such as water, oil, and grease from the joint area before welding.
- Use short arc and narrow pass technique with maximum bead swing not exceeding three times the electrode diameter.
- Follow recommended current ranges: 2.5 mm (F(H)-70-100 A / V(OH)-60-90 A), 3.2 mm (F(H)-90-130 A / V(OH)-80-120 A), 4.0 mm (F(H)-140-180 A / V(OH)-130-170 A), 5.0 mm (F(H)-170-220 A)
How It Compares
AK-J707 and E10015-G both meet the same classification standards and are used for high strength steel welding. AK-J707 uses a low hydrogen sodium coating, which provides lower diffused hydrogen levels and better crack resistance compared to rutile or cellulose types. Unlike some high strength electrodes that require strict drying and are limited to flat or horizontal positions, AK-J707 supports all-position welding with DC reverse polarity. It is not suitable for AC operation.
Related Grades
Other welding electrodes in the same family.
AK-J707 Questions
What is the recommended baking temperature and time?
What are the current ranges for each diameter?
What standards does AK-J707 meet?
What is the diffused hydrogen content in the deposited metal?
What packing is AK-J707 supplied in?
Can we test AK-J707 before placing a production order?
Request a Quotation for AK-J707
Send the diameter, the quantity and the destination port. Our technical team replies with packing, pricing and the data you need to qualify the grade.